Mastervolt DC-DC Converter Mac Plus 12/12V-50 - 81205100

588,52 VAT inc.


Rated output voltage 12 V
Output voltage 10-15 V
Peak capacity 725 W
Power (W) 675 W
Max. output current 50 A
Protection IP23

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Product information

Increase the charging voltage of your service battery!

Charging service batteries on board a vehicle or vessel can be complicated. The recharging process is often time-consuming and the batteries may not be fully charged. This is a common problem on boats, work vans, motorhomes and trucks. Smart alternators and start/stop systems make the situation even worse.

Robust DC-DC charger ensures optimum condition of service batteries

Normally, the service battery is connected to the starter battery by means of a charging relay. The starter battery is located close to the alternator and receives most of the charging current. However, the service battery is usually remote. Long cables cause voltage drops, which leads to a slow charging process and results in device failures and premature battery failure.

Modern fuel-efficient engines are equipped with intelligent alternators in accordance with the latest standards, such as Euro 5 and Euro 6. Instead of supplying a constant power supply, intelligent alternators provide a variable voltage; after a short charging period, the voltage is reduced and the charging process stops. In addition, the energy produced with regenerative braking causes voltage peaks. Service batteries installed in the traditional mode are hardly charged at all and can be damaged as a result of these voltage peaks.

To solve these problems, Mastervolt introduces the Mastervolt DC-DC Converter Mac Plus 12/12V-50 - 81205100. The Mac Plus monitors the status of the service battery and compensates for voltage loss. The proven 3-stage algorithm ensures fast and safe charging. In addition, by stabilizing the charging voltage, the Mac Plus protects service batteries and sensitive equipment.

Features of the Mastervolt DC-DC Converter Mac Plus 12/12V-50 - 81205100

- Fast and safe charging during short trips.
- Fanless design for quiet operation.
- Suitable for liquid, gel, AGM and lithium-ion batteries (incl. LiFePO4).
- Charges even completely discharged batteries.
- Engine running detection protects the starter battery.
- Adjustable current limits to meet Euro 5/6 requirements.
- Voltage stabilization protects equipment, lighting and sensitive loads.
- Parallel operation to obtain a load capacity in excess of 100 A.
- MasterBus for intelligent system monitoring and automation.
- Temperature compensation and voltage sensing for optimum charging results.
- E-mark certification for mobile applications.
- Power supply mode.
- Heavy-duty connections for easy installation and quick configuration via DIP switches.


Allows to increase the charging voltage when the service battery is far from the charging source or in systems equipped with a smart alternator. Also suitable when a stable power supply or a different system voltage is required.

Programmable from a computer

Remote control of the Mac from your laptop or desktop PC; you can also set your personal preferences. The device has a communications port and installation is simple with a PC Link and MasterAdjust software.

Parallel connection

Parallel configuration of several units will allow you to generate more than 100 amps. Advanced high-frequency technology with modern microprocessors ensures minimal power loss when switching from 24 V to 12 V and vice versa.

Datasheet Mastervolt DC-DC Converter Mac Plus 12/12V-50 - 81205100

See Mac Plus 12/12V-50 DC-DC Converter datasheet - 81205100

Additional information

Weight2 kg
Dimensions26 × 17 × 7 cm

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